CN114069581A - Power grid short-circuit current limiting method - Google Patents
Power grid short-circuit current limiting method Download PDFInfo
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- CN114069581A CN114069581A CN202111402098.XA CN202111402098A CN114069581A CN 114069581 A CN114069581 A CN 114069581A CN 202111402098 A CN202111402098 A CN 202111402098A CN 114069581 A CN114069581 A CN 114069581A
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- power grid
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
Abstract
The invention discloses a power grid short-circuit current limiting method, which comprises the following steps: acquiring current power grid parameters; calculating the short-circuit current of the current power grid according to the current power grid parameters; judging whether the current breaking capacity of a breaker in the current power grid exceeds the maximum breaking capacity or not according to the current power grid current obtained by calculation; when the breaking capacity of the breaker in the current power grid is larger than or equal to the maximum breaking capacity, the current power grid is overhauled and modified, so that the breaking capacity of the breaker in the current power grid is smaller than the maximum breaking capacity; when the breaking capacity of the breaker in the current power grid is smaller than the maximum breaking capacity and is larger than or equal to N% of the maximum breaking capacity, the construction of the power grid network frame is planned, so that the breaking capacity of the breaker in the planned power grid is smaller than N% of the maximum breaking capacity, and the method can effectively solve the problem that the short-circuit current of the power grid exceeds the standard.
Description
Technical Field
The invention belongs to the field of power grid planning, and relates to a power grid short-circuit current limiting method.
Background
In recent years, with the development of high quality of economy, the demand for electric power has been increasing, and the demand for safe and reliable supply of electric power has been increasing. In order to meet the power consumption requirement, the installed scale of the power supply is continuously increased, and new energy and thermal power supplies connected to a main network are increased; in order to improve the stability of the power system, the power grid structure is more and more compact, and the electrical distance is continuously shortened. The increase in power access and the reduction in electrical distance together cause rapid increases in main network short circuit current. How to solve the problem of the exceeding of the short-circuit current of the power grid is an important research direction in the industry.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power grid short-circuit current limiting method which can effectively solve the problem that the power grid short-circuit current exceeds the standard.
In order to achieve the purpose, the method for limiting the short-circuit current of the power grid comprises the following steps:
acquiring current power grid parameters;
calculating the short-circuit current of the current power grid according to the current power grid parameters;
judging whether the current breaking capacity of a breaker in the current power grid exceeds the maximum breaking capacity or not according to the current power grid current obtained by calculation;
when the breaking capacity of the breaker in the current power grid is larger than or equal to the maximum breaking capacity, the current power grid is overhauled and modified, so that the breaking capacity of the breaker in the current power grid is smaller than the maximum breaking capacity;
and when the breaking capacity of the circuit breaker in the current power grid is smaller than the maximum breaking capacity and is larger than or equal to N% of the maximum breaking capacity, planning the construction of the power grid network frame, so that the planned breaking capacity of the circuit breaker in the power grid is smaller than N% of the maximum breaking capacity.
N＝95。
And calculating the short-circuit current of the power grid by using a power grid planning simulation calculation analysis platform according to the current power grid parameters.
And judging whether the breaking capacity of the breaker in the current power grid is greater than or equal to the maximum breaking capacity by utilizing a power grid planning simulation calculation analysis platform according to the current power grid current obtained by calculation.
The current power grid parameters comprise current power grid current, parameters of a high-impedance transformer, current neutral point small reactance, current length of a line in the power grid, resistance of the transformer and parameters of a series compensation device.
The power grid is a 330kV power grid or a 750kV power grid.
The invention has the following beneficial effects:
when the method for limiting the short-circuit current of the power grid is specifically operated, whether the current breaking capacity of the breaker in the power grid exceeds the maximum breaking capacity or not is judged according to the current power grid current, and when the current breaking capacity of the breaker in the power grid is in relation with the maximum breaking capacity, the power grid is overhauled and modified, so that the problem that the short-circuit current of the power grid exceeds the standard is solved.
Drawings
Fig. 1 is a local grid diagram according to the first embodiment.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The method for limiting the short-circuit current of the power grid comprises the following steps:
acquiring current power grid parameters;
calculating the short-circuit current of the current power grid according to the current power grid parameters;
judging whether the current breaking capacity of the breaker in the current power grid exceeds the maximum breaking capacity or not according to the calculated current power grid current,
when the breaking capacity of the breaker in the current power grid is larger than or equal to the maximum breaking capacity, the current power grid is overhauled and modified, so that the breaking capacity of the breaker in the current power grid is smaller than the maximum breaking capacity;
and when the breaking capacity of the circuit breaker in the current power grid is smaller than the maximum breaking capacity and is larger than or equal to N% of the maximum breaking capacity, planning the construction of the power grid network frame, so that the planned breaking capacity of the circuit breaker in the power grid is smaller than N% of the maximum breaking capacity.
N＝95。
And calculating the short-circuit current of the power grid by using a power grid planning simulation calculation analysis platform according to the current power grid parameters.
And judging whether the breaking capacity of the breaker in the current power grid is greater than or equal to the maximum breaking capacity by utilizing a power grid planning simulation calculation analysis platform according to the current power grid current obtained by calculation.
The current power grid parameters comprise current power grid current, parameters of a high-impedance transformer, current neutral point small reactance, current length of a line in the power grid, resistance of the transformer and parameters of a series compensation device.
The power grid is a 330kV power grid or a 750kV power grid.
Example one
A main rack system adopts a mode of replacing a switch, hot standby one return wire and installing a small reactance additionally at an opposite side transformer substation to limit short-circuit current, a 330kV A transformer substation is taken as an example, the single-phase short-circuit current of a 330kV bus is 38.78kA and is close to the interruption capacity. Other sites have short circuit current levels within reasonable ranges as shown in table 1.
If the A substation is replaced by a 50kA switch, no measures need to be taken. When the A substation is still a 40kA switch, temporary measures need to be taken. And a return line of the D-F transformer substation is prepared, and the single-phase short-circuit current of the 330kV bus of the A transformer substation is reduced to 37.16 kA. And a neutral point of each main transformer of the D transformer substation is additionally provided with a small reactance of 14 ohms, and the single-phase short-circuit current of the 330kV bus of the A transformer substation is reduced to 37.57kA, as shown in Table 2.
The present invention can be generalized to larger scale grid systems and is not limited to the local grid shown in fig. 1.
TABLE 1
| Bus bar | Single phase short circuit | Three-phase short circuit | Interruption capacity |
| A | 38.78 | 35.22 | 40 |
| B | 45.19 | 40.02 | 50 |
| C | 29.34 | 28.63 | 40 |
| D | 55.27 | 45.4 | 63 |
| E | 42.36 | 38 | 50 |
| F | 41.07 | 36.9 | 63 |
TABLE 2
Example two
In 2023, all the direct-current matching power supplies are put into production, and a third main transformer of a 750KV transformer substation 6 is expanded. The local area is built into 11750 KV transmission and transformation engineering. 2 100 ten thousand kilowatt units are switched in at 750 kilovolts to substation 1.
The single-phase and three-phase short-circuit currents in the Shaanxi region of 2023 were calculated, and the results are shown in Table 3.
1750 kilovolt three-phase short-circuit current of the transformer substation exceeds the breaking capacity of the switch, reaches 51.6 kiloamperes, and in addition, 4 transformer substations are more than 40 kiloamperes, namely a transformer substation 2, a transformer substation 3, a transformer substation 4 and a transformer substation 8.
TABLE 3
As can be seen from table 3, the substation 1 may exceed the maximum breaking capacity, for which the following measures are taken:
30-ohm series resistance is installed on the double loops of the Qian county side of the lines of the transformer substation 1-4, and the Qian county variable short-circuit current still reaches the switch interruption capacity.
When the 1-circuit line of the transformer substation 1-4 is pulled down, the short circuit current in Qian county still exceeds the switch interruption capacity.
And (4) stopping 1 circuit of the transformer substation 1-the transformer substation 4 and 1 circuit of the transformer substation 1-the transformer substation 2, and reducing the three-phase short-circuit current of the transformer substation 1 to about 46 kiloamperes.
Considering that the operation reliability of the power grid is reduced by pulling and stopping lines, and as the power grid develops, a main 750kv grid frame is continuously strengthened and a large thermal power supply is continuously connected in the future, the short-circuit current level of the 1750 kv side of the substation is further increased, so that the substation 1 is recommended to replace 63 ka switches in 2022, and reference is made to table 4.
TABLE 4
Claims (6)
1. A power grid short-circuit current limiting method is characterized by comprising the following steps:
acquiring current power grid parameters;
calculating the short-circuit current of the current power grid according to the current power grid parameters;
judging whether the current breaking capacity of a breaker in the current power grid exceeds the maximum breaking capacity or not according to the current power grid current obtained by calculation;
when the breaking capacity of the breaker in the current power grid is larger than or equal to the maximum breaking capacity, the current power grid is overhauled and modified, so that the breaking capacity of the breaker in the current power grid is smaller than the maximum breaking capacity;
and when the breaking capacity of the circuit breaker in the current power grid is smaller than the maximum breaking capacity and is larger than or equal to N% of the maximum breaking capacity, planning the construction of the power grid network frame, so that the planned breaking capacity of the circuit breaker in the power grid is smaller than N% of the maximum breaking capacity.
2. The grid short circuit current limiting method according to claim 1, wherein N-95.
3. The method for limiting the short-circuit current of the power grid according to claim 1, wherein the short-circuit current of the power grid is calculated by using a power grid planning simulation calculation analysis platform according to the current power grid parameters.
4. The method for limiting the short-circuit current of the power grid according to claim 1, wherein whether the current breaking capacity of the breaker in the current power grid is greater than or equal to the maximum breaking capacity is judged by using a power grid planning simulation calculation analysis platform according to the calculated current power grid current.
5. The grid short-circuit current limiting method according to claim 1, wherein the current grid parameters comprise current grid current, parameters of a high-impedance transformer, current neutral point small reactance, current length of line in the grid, resistance of the transformer and parameters of a series compensation device.
6. The grid short-circuit current limiting method according to claim 1, wherein the grid is a 330kV grid or a 750kV grid.
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2021
- 2021-11-19 CN CN202111402098.XA patent/CN114069581A/en active Pending
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